Paginação para tipos personalizados de post (custom post types)

O Arquivo index do template é esse abaixo:

<?php
/**
 * The main template file.
 *
 * This is the most generic template file in a WordPress theme
 * and one of the two required files for a theme (the other being style.css).
 * It is used to display a page when nothing more specific matches a query.
 * E.g., it puts together the home page when no home.php file exists.
 * Learn more: http://codex.wordpress.org/Template_Hierarchy
 *
 * @package neogenfmk
 */

get_header(); ?>

<?php
// WP_Query arguments
$args = array (
	       'post_type'              => 'imovel',
           'posts_per_page' => '4',
	       'order'                  => 'DESC',
	       'orderby'                => 'date',
);
// The Query
$listing_loop = new WP_Query( $args );?>

<div id="primary" class="content-area row">

    <main id="main" class="site-main" role="main">

        <?php if ( $listing_loop->have_posts() ) : ?>

        <?php while ( $listing_loop->have_posts() ) : $listing_loop->the_post(); ?>
				<?php get_template_part( 'content', 'imovel' ); ?>
        <?php endwhile; ?>

        <?php ngwpfmk_paging_nav(); ?>
        <?php else : ?>

	    <?php get_template_part( 'content', 'none' ); ?>
        <?php endif; ?>

    </main><!-- #main -->
</div><br>
<?php //get_sidebar(); ?>
<?php get_footer(); ?>

Ainda não funciona, o retorno é 404! deixo abaixo a função inclusa no functions.php e a index modificada:

function base_pagination() {
global $listing_query;

$big = 999999999; // This needs to be an unlikely integer

// For more options and info view the docs for paginate_links()
// http://codex.wordpress.org/Function_Reference/paginate_links
$paginate_links = paginate_links( array(
'base' => str_replace( $big, '%#%', get_pagenum_link($big) ),
'current' => max( 1, get_query_var('paged') ),
'total' => $listing_query->max_num_pages,
'mid_size' => 5
) );

// Display the pagination if more than one page is found
if ( $paginate_links ) {
echo '<div class="pagination">';
echo $paginate_links;
echo '</div><!--// end .pagination -->';
}
}
//Fim functions.php
<?php
/**
* The main template file.
*
* This is the most generic template file in a WordPress theme
* and one of the two required files for a theme (the other being style.css).
* It is used to display a page when nothing more specific matches a query.
* E.g., it puts together the home page when no home.php file exists.
* Learn more: http://codex.wordpress.org/Template_Hierarchy
*
* @package neogenfmk

*/
// WP_Query arguments
$paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
$args = array (
'post_type' => 'imovel',
'pagination' => true,
'paged' => $paged,
'posts_per_page' => '4',
'ignore_sticky_posts' => true,
'order' => 'DESC',
'orderby' => 'date',
);

get_header(); ?>
<?php $listing_query = new WP_Query( $args );?>
<?php include 'inc/sliderini.php'; ?>
<div id="primary" class="content-area row">

<main id="main" class="site-main" role="main">

<?php if ( $listing_query->have_posts() ) : ?>

<?php while ( $listing_query->have_posts() ) : $listing_query->the_post(); ?>
<?php get_template_part( 'content', 'imovel' ); ?>
<?php endwhile; ?>

<?php ngwpfmk_paging_nav(); ?>
<?php else : ?>

<?php get_template_part( 'content', 'none' ); ?>
<?php endif; ?>
<?php base_pagination();?>
</main><!-- #main -->
</div>
<?php //get_sidebar(); ?>
<?php get_footer(); ?>

O WP está construindo certo a estrutura de paginação, eu não estou conseguindo entender como estruturar o link para a próxima página.

http://site.webimoveisrs.com.br/

<br />
<?php<br />
/**<br />
 * The main template file.<br />
 *<br />
 * This is the most generic template file in a WordPress theme<br />
 * and one of the two required files for a theme (the other being style.css).<br />
 * It is used to display a page when nothing more specific matches a query.<br />
 * E.g., it puts together the home page when no home.php file exists.<br />
 * Learn more: http://codex.wordpress.org/Template_Hierarchy<br />
 *<br />
 * @package neogenfmk<br />
 */<br />
// WP_Query arguments<br />
$args = array (<br />
	'post_type'              => 'imovel',<br />
	'pagination'             => true,<br />
	'paged'                  => get_query_var('paged'),<br />
	'posts_per_page'         => '4',<br />
	'ignore_sticky_posts'    => true,<br />
	'order'                  => 'DESC',<br />
	'orderby'                => 'date',<br />
);<br />
/** START Pagination Function */<br />
function paginate_posts($total_pages, $current){</p>
<p>	if ( $total_pages > 1 )  {</p>
<p>		if ( !$current_page = get_query_var('paged') )<br />
			$current_page = 1;<br />
		$big = 999999999;</p>
<p>		$permalink_structure = get_option('permalink_structure');<br />
		$format = empty( $permalink_structure ) ? '&page=%#%' : 'page/%#%/';<br />
		echo paginate_links(array(<br />
			'base' => str_replace( $big, '%#%', get_pagenum_link( $big ) ),<br />
			'format' => $format,<br />
			'current' => $current_page,<br />
			'total' => $total_pages,<br />
			'mid_size' => 2,<br />
			'type' => 'plain',<br />
			'prev_text'    => __('«'),<br />
			'next_text'    => __('»'),<br />
			));<br />
	}<br />
}<br />
/** END Pagination Function */<br />
get_header(); ?><br />
<?php $listing_query = new WP_Query( $args );?><br />
<?php include 'inc/sliderini.php'; ?><br />
<div id="primary" class="content-area row"></p>
<p>    <main id="main" class="site-main" role="main"></p>
<p>        <?php if ( $listing_query->have_posts() ) : ?></p>
<p>        <?php while ( $listing_query->have_posts() ) : $listing_query->the_post(); ?><br />
				<?php get_template_part( 'content', 'imovel' ); ?><br />
        <?php endwhile; ?></p>
<p>        <?php ngwpfmk_paging_nav(); ?><br />
        <?php else : ?></p>
<p>	    <?php get_template_part( 'content', 'none' ); ?><br />
        <?php endif; ?></p>
<p>        <?php if ( !$current_page = get_query_var('paged') )<br />
		$current_page = 1;<br />
	    paginate_posts($listing_query->max_num_pages, $current_page);?></p>
<p>    </main> <!-- #main --><br />
</div><br />
<?php //get_sidebar(); ?><br />
<?php get_footer(); ?><br />

Depois de buscar ajuda no grupo do facebook WordPress Brasil e encontrar o Matheus Lopes conseguimos(ele conseguiu) resolver o problema. Estava faltando uma condicional que avaliasse a localização do usuário em relação ao sistema. Se o usuário está navegando na home, a função trata o paginador como page, se a navegação está em páginas do escopo, a função trata como paged

Link para pastebin do código completo

Meu agradecimento a todos que ajudaram a resolver esse pequeno e incômodo problema em especial ao Matheus Lopes que foi quem realmente resolveu essa questão.